Vladislav Roslyakov, and his school massacre in Crimea
The largest school massacre that occurred in Russia, was carried out in 2018 by a school student, in total there were almost 100 people between dead and wounded.
Massacre
Nikolas Jacob Cruz, and the massacre at Stoneman Douglas High School
Considered the deadliest school massacre, Nikolas Cruz murdered 17 people and injured 15 others in a premeditated massacre at Marjory Stoneman Douglas High School, Florida, USA.